Expansion of e.g.f.: cos(log(1 + sinh(x))).

Terms

a(0) =1a(1) =0a(2) =-1a(3) =3a(4) =-14a(5) =70a(6) =-406a(7) =2723a(8) =-20684a(9) =176100a(10) =-1661236a(11) =17182143a(12) =-193042904a(13) =2335585330a(14) =-30176889016a(15) =412862112263